# Invoice Master POC v2

Swedish Invoice Field Extraction System - YOLO26 + PaddleOCR 从瑞典 PDF 发票中提取结构化数据。

## Tech Stack

| Component | Technology |
|-----------|------------|
| Object Detection | YOLO26 (Ultralytics >= 8.4.0) |
| OCR Engine | PaddleOCR v5 (PP-OCRv5) |
| PDF Processing | PyMuPDF (fitz) |
| Database | PostgreSQL + psycopg2 |
| Web Framework | FastAPI + Uvicorn |
| Deep Learning | PyTorch + CUDA 12.x |

## WSL Environment (REQUIRED)

**Prefix ALL commands with:**

```bash
wsl bash -c "source ~/miniconda3/etc/profile.d/conda.sh && conda activate invoice-sm120 && <command>"
```

**NEVER run Python commands directly in Windows PowerShell/CMD.**

## Project-Specific Rules

- Python 3.11+ with type hints
- No print() in production - use logging
- Run tests: `pytest --cov=src`

## Critical Rules

### Code Organization

- Many small files over few large files
- High cohesion, low coupling
- 200-400 lines typical, 800 max per file
- Organize by feature/domain, not by type

### Code Style

- No emojis in code, comments, or documentation
- Immutability always - never mutate objects or arrays
- No console.log in production code
- Proper error handling with try/catch
- Input validation with Zod or similar

### Testing

- TDD: Write tests first
- 80% minimum coverage
- Unit tests for utilities
- Integration tests for APIs
- E2E tests for critical flows

### Security

- No hardcoded secrets
- Environment variables for sensitive data
- Validate all user inputs
- Parameterized queries only
- CSRF protection enabled

## Environment Variables

```bash
# Required
DB_PASSWORD=

# Optional (with defaults)
DB_HOST=192.168.68.31
DB_PORT=5432
DB_NAME=docmaster
DB_USER=docmaster
MODEL_PATH=runs/train/invoice_fields/weights/best.pt
CONFIDENCE_THRESHOLD=0.5
SERVER_HOST=0.0.0.0
SERVER_PORT=8000
```
## Available Commands

- `/tdd` - Test-driven development workflow
- `/plan` - Create implementation plan
- `/code-review` - Review code quality
- `/build-fix` - Fix build errors

## Git Workflow

- Conventional commits: `feat:`, `fix:`, `refactor:`, `docs:`, `test:`
- Never commit to main directly
- PRs require review
- All tests must pass before merge
